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Nutone-Broan 885Bl Wall Cap, Steel, Black, for 3" and 4" round duct. With the Nutone-Broan 885Bl Wall Cap, Steel, Black; you will be pleased with its performance. Whether you arerepacing an old fixture, or installing one for the first time, you will be impressed with its construction and features. The Nutone-Broan 885Bl Wall Cap offers sturdy steel gauge, and steel screen, grate. This helps to keep the critters out when its open and in use.